The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 1997
Filed:
Feb. 03, 1995
Toshiaki Tsuboi, Kawasaki, JP;
Akira Yamamoto, Sagamihara, JP;
Shigeo Honma, Odawara, JP;
Yoshihiro Asaka, Odawara, JP;
Koji Ozawa, Hiratsuka, JP;
Hiroyuki Kitajima, Yokohama, JP;
Michio Miyazaki, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Microcomputer System, Ltd., Tokyo, JP;
Abstract
In allocating an area of a cache memory to each storage unit, proper allocation of the cache memory is made to each storage unit. If the amount of write-after data becomes equal to or more than a threshold value, an allocation limit is set to each disk unit. If CPU issues a data write request requiring the amount of data equal to or more than the allocation limit, the data write request is held in a wait state until the amount of write-after data becomes less than the allocation limit. Therefore, the allocation amount to the disk unit becomes neither too large nor too small. In this manner, proper allocation of the cache memory to each disk unit can be realized.